Plate Boundaries and Volcanoes

Details about different plate boundaries and what goes on regarding a volcano

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Earth's Structure

Two different types of crusts. 

Continental Crust: Carries the land

Oceanic Crust: Carries water

This can be easily remembered, as the Ocean relates to water, and the Continental crust can be remembered for carrying the land, as the land is CONTinuous.

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Plates and different plate boundaries

Plates are pieces of the earth's crust that have been broken up.

Convection currents are created when heat rises and falls inside the mantle.

  • This is a product of radioactive decay in the core.

→ Plates are moved due to convection currents.

Plate boundary: The point where two plates meet

Constructive: Plates move apart Conservative: Plates slide past eachother

  • Under sea
  • Magma pushes up between two plates

Destructive: Plates move towards eachother

  • Continental and Oceanic plate
  • Oceanic forced underneath Continental - Oceanic denser
  • Oceanic plate melts - forms magma - magma chamber
  • Forms fold mountains - Alps and Himalayas


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Different types of volcanoes

Supervolcano:

Eruptions are thousands of years apart. They are at a much larger scale. Magma is building up and eventually, gas and ash is released from thet op of the volcano, due to the bulge that has been formed.

Composite:

Made up of different amounts of lava and ash. Found at destructive plate boundaries. Mixture of hot steam, lava, ash, rock and dust. 

Shield:

Found at constructive plate boundaries. Eruptions are frequent but gentle. Caused by thin and runny lava.

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Positive and Negative effects of an eruption

Positive:

  • Profit - scenery created from eruption attracts tourists
  • Lava and ash deposited - nutrients for soil - agriculture
  • Geothermal energy

Negative:

  • Lives lost
  • Lahars - mudflows created from ash and mud mixing with rain waiter/snow
  • Settlements destroyed
  • Landscapes destroyed/changed
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